Comment #2 on issue 2027 by smichr: Mul.flatten violates power rules http://code.google.com/p/sympy/issues/detail?id=2027
For them to come together? You can only bring in 1 negative if you don't know the exponent is an integer. And for the ((-1)**x)**2, that is always equal to (-1)**(2*x) but the reverse is not true unless x is an integer or that -1 is a positive value.
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